<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 表单操作--数据采集 -->
    <form action="">
        姓名：<input type="text" name="" id="" placeholder="请输入您的姓名" required>
        <br>
        密码：<input type="password" placeholder="请输入密码">
        <br>
        年龄：<input type="number" placeholder="请输入年龄">
        <input type="submit" name="" id="">
    </form>
</body>
</html>